Regarding probability, which of the following is correct?
a. When events A and B are mutually exclusive, then P(A and B) = P(A) + P(B).
b. The union of events A and B consists of all outcomes in the sample space that are contained in both event A and event B.
c. When two events A and B are independent, the joint probability of the events can be found by multiplying the probabilities of the individual events.
d. The probability of the union of two events can exceed one.